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From: "dodji at redhat dot com" <sourceware-bugzilla@sourceware.org>
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Subject: [Bug default/26646] unexpected declaration-only types
Date: Thu, 10 Feb 2022 17:36:42 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D26646

--- Comment #19 from dodji at redhat dot com ---
(In reply to gprocida from comment #15)
> Hi Dodji.
>=20
> I collected shortest paths from symbols to struct udp_table in the ABI for
> vmlinux4 and I've traced one by hand through the DWARF DIEs (readelf
> --debug-dump) for vmlinux3:
>=20
> function symbol dev_get_by_name (in ksymtab) has a parameter of type stru=
ct
> net *=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20
> struct net has member rtln of type struct sock *=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
>=20
> struct sock has member sk_prot_creator of type struct proto *=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20
>=20
> struct proto has member h of an anonymous union type=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
>=20
> the anonymous union type has member udp_table of type struct udp_table *=
=20=20=20=20
>=20
> struct udp_table is fully defined
>=20
> If you can see why this path is not being considered by the DWARF reader,=
 I
> think the fix will address more than just this one instance.
>=20
> Regards,
> Giuliano.

Thanks a lot for this analysis, it's super useful.

I came up with this patch
https://sourceware.org/bugzilla/attachment.cgi?id=3D13970.  Would it move t=
he
needle a bit more?

--=20
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